Patents by Inventor Takumi Hatsuda
Takumi Hatsuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7420018Abstract: The present invention provides: a water-absorbing agent which has excellent urine resistance; a water-absorbing agent which has not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time; and production processes and uses for these water-absorbing agents. The present invention water-absorbing agent exhibits a specific or larger value of absorption capacity under a load in a process in which the absorption capacity under a load is measured in a new manner using a specific liquid to be absorbed, and the present invention provides an absorbent matter and an absorbent article which display a specific or larger value of new absorption index as is, for example, led from the absorption capacity under a load or from the resin concentration using the above water-absorbing agent. The present invention further provides a production process for a water-absorbing agent having the above specific parameter.Type: GrantFiled: July 9, 2005Date of Patent: September 2, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Katsuyuki Wada, Hiroko Ueda, Naoko Takahashi, Kinya Nagasuna, Koji Miyake, Yasuhiro Fujita, Takumi Hatsuda
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Patent number: 7183456Abstract: In a production process for a water-absorbent resin, comprising the steps of: blending a liquid material and a water-absorbent resin; and heating the resultant mixture in order to produce a modified water-absorbent resin, the present invention is to provide: a method for uniformly and efficiently treating a water-absorbent resin favorably in view of industry, and as a result, a good-balanced water-absorbent resin having various excellent properties, such absorption capacity without a load, absorption capacity under a load, and single-layer absorption capacity under a load in contact with an aqueous liquid. The production process comprises the step of spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C), wherein the liquid material (B) is sprayed from the spray nozzle (C) and its spray pattern is a circular and hollow cone shape or a double-convex-lens and elliptic cone shape.Type: GrantFiled: January 27, 2004Date of Patent: February 27, 2007Assignee: Nippon Shokubai Co., Ltd.Inventors: Takumi Hatsuda, Yoshio Irie, Masatoshi Nakamura, Katsuyuki Wada, Shinichi Fujino, Kazuki Kimura, Kunihiko Ishizaki
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Patent number: 7153910Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.Type: GrantFiled: August 5, 2002Date of Patent: December 26, 2006Assignee: Nippon Shokubai: Co., Ltd.Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
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Patent number: 7078458Abstract: In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a ?-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.Type: GrantFiled: December 20, 2004Date of Patent: July 18, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Yoshio Irie, Katsuhiro Kajikawa, Kunihiko Ishizaki, Takumi Hatsuda
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Patent number: 6998447Abstract: In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a ?-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.Type: GrantFiled: March 29, 2002Date of Patent: February 14, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Yoshio Irie, Katsuhiro Kajikawa, Kunihiko Ishizaki, Takumi Hatsuda
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Publication number: 20050272600Abstract: The present invention provides: a water-absorbing agent which has excellent urine resistance; a water-absorbing agent which has not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time; and production processes and uses for these water-absorbing agents. The present invention water-absorbing agent exhibits a specific or larger value of absorption capacity under a load in a process in which the absorption capacity under a load is measured in a new manner using a specific liquid to be absorbed, and the present invention provides an absorbent matter and an absorbent article which display a specific or larger value of new absorption index as is, for example, led from the absorption capacity under a load or from the resin concentration using the above water-absorbing agent. The present invention further provides a production process for a water-absorbing agent having the above specific parameter.Type: ApplicationFiled: July 9, 2005Publication date: December 8, 2005Inventors: Katsuyuki Wada, Hiroko Ueda, Naoko Takahashi, Kinya Nagasuna, Koji Miyake, Yasuhiro Fujita, Takumi Hatsuda
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Publication number: 20050113542Abstract: In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a ?-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.Type: ApplicationFiled: December 20, 2004Publication date: May 26, 2005Inventors: Yoshio Irie, Katsuhiro Kajikawa, Kunihiko Ishizaki, Takumi Hatsuda
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Patent number: 6817557Abstract: The present invention provides: a process for treating a particulate water-absorbent resin, which enables to carry out pulverization stably in a process for producing a particulate water-absorbent resin, and transportation or storage of the particulate water-absorbent resin stably during or after producing the particulate water-absorbent resin, and to prevent contamination of cohered matters of the particulate water-absorbent resin; and involves no or little deterioration of properties. The process for treating a particulate water-absorbent resin is characterized by carrying out at least one selected from the group consisting of: (1) heating at least one portion of a surface getting contact with the particulate water-absorbent resin from the outside, (2) maintaining the temperature of at least one portion of a surface getting contact with the particulate water-absorbent resin at 30 to 150° C.Type: GrantFiled: January 4, 2001Date of Patent: November 16, 2004Assignee: Nippon Shokubai Co., Ltd.Inventors: Hiroyuki Kakita, Tatsuo Maruo, Takumi Hatsuda, Yoshio Irie
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Publication number: 20040186244Abstract: In a production process for a water-absorbent resin, comprising the steps of: blending a liquid material and a water-absorbent resin; and heating the resultant mixture in order to produce a modified water-absorbent resin, the present invention is to provide: a method for uniformly and efficiently treating a water-absorbent resin favorably in view of industry, and as a result, a good-balanced water-absorbent resin having various excellent properties, such absorption capacity without a load, absorption capacity under a load, and single-layer absorption capacity under a load in contact with an aqueous liquid. The production process comprises the step of spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C), wherein the liquid material (B) is sprayed from the spray nozzle (C) and its spray pattern is a circular and hollow cone shape or a double-convex-lens and elliptic cone shape.Type: ApplicationFiled: January 27, 2004Publication date: September 23, 2004Inventors: Takumi Hatsuda, Yoshio Irie, Masatoshi Nakamura, Katsuyuki Wada, Shinichi Fujino, Kazuki Kimura, Kunihiko Ishizaki
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Patent number: 6720389Abstract: In a production process for a water-absorbent resin, comprising the steps of: blending a liquid material and a water-absorbent resin; and heating the resultant mixture in order to produce a modified water-absorbent resin, the present invention is to provide: a method for uniformly and efficiently treating a water-absorbent resin favorably in view of industry, and as a result, a good-balanced water-absorbent resin having various excellent properties, such absorption capacity without a load, absorption capacity under a load, and single-layer absorption capacity under a load in contact with an aqueous liquid. The production process comprises the step of spray-blending a water-absorbent resin (A) and a liquid material (B) with a blending apparatus equipped with a spray nozzle (C), wherein the liquid material (B) is sprayed from the spray nozzle (C) and its spray pattern is a circular and hollow cone shape or a double-convex-lens and elliptic cone shape.Type: GrantFiled: September 5, 2001Date of Patent: April 13, 2004Assignee: Nippon Shokubai Co., Ltd.Inventors: Takumi Hatsuda, Yoshio Irie, Masatoshi Nakamura, Katsuyuki Wada, Shinichi Fujino, Kazuki Kimura, Kunihiko Ishizaki
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Patent number: 6667372Abstract: A continuous manufacturing method of a water-absorbent polymer by continuously performing a polymerization of a hydrophilic monomer using a solution containing a hydrophilic monomer, includes at least one of the following steps (A) to (D): (A) introducing an inert gas into the solution in a continuous manner before subjecting the solution to a polymerization reaction, and subsequently removing the inert gas from the solution; (B) supplying the solution to a polymerization process, and washing out the solution with water supplied before, at, or after a timing of supplying the solution to the polymerization process; (C) detecting reaction temperatures of a polymerization reaction in non-contact manner at a plurality of points different distances away from a point where a solution is supplied; and (D) supplying water to a water-containing gel and/or transport means when transporting the water-containing gel of the water-absorbent polymer obtained in or after the polymerization reaction.Type: GrantFiled: October 31, 2000Date of Patent: December 23, 2003Assignee: Nippon Shokubai Co., Ltd.Inventors: Koji Miyake, Takumi Hatsuda, Sachio Fujita, Takashi Nishigaki, Kunihiko Ishizaki, Katsuhiro Kajikawa
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Publication number: 20030176589Abstract: The present invention provides: a water-absorbing agent which has excellent urine resistance; a water-absorbing agent which has not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time; and production processes and uses for these water-absorbing agents. The present invention water-absorbing agent exhibits a specific or larger value of absorption capacity under a load in a process in which the absorption capacity under a load is measured in a new manner using a specific liquid to be absorbed, and the present invention provides an absorbent matter and an absorbent article which display a specific or larger value of new absorption index as is, for example, led from the absorption capacity under a load or from the resin concentration using the above water-absorbing agent. The present invention further provides a production process for a water-absorbing agent having the above specific parameter.Type: ApplicationFiled: March 3, 2003Publication date: September 18, 2003Applicant: Nippon Shokubai Co., Ltd.Inventors: Katsuyuki Wada, Hiroko Ueda, Naoko Takahashi, Kinya Nagasuna, Koji Miyake, Yasuhiro Fujita, Takumi Hatsuda
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Patent number: 6599989Abstract: Water-absorbing agents containing polycarboxylic amine chelating agents. The water-absorbing agents are obtained by a process including the step of adding to a water-absorbent resin at least one chelating agent selected from the group consisting of polycarboxylic amines and maleic hydrophilic polymers. The polycarboxylic amine may be selected from a class that includes N-carboxymethyl-aspartic acid as one of its members or selected from a class that includes N,N′-bis(1,2-dicarboxyethyl)-ethylenediamine as one of its members. The water-absorbing agents have not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time.Type: GrantFiled: February 22, 1999Date of Patent: July 29, 2003Assignee: Nippon Skokubai Co., Ltd.Inventors: Katsuyuki Wada, Hiroko Ueda, Naoko Takahashi, Kinya Nagasuna, Koji Miyake, Yasuhiro Fujita, Takumi Hatsuda
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Patent number: 6586549Abstract: The present invention provides: a water-absorbing composition such that portions containing the water-absorbing composition in a high concentration exhibit excessive-liquid permeation buffering effects in absorbent articles comprising the water-absorbing composition and hydrophilic fibers; and a use of this water-absorbing composition. The water-absorbing composition comprises a water-absorbent resin and an excessive-liquid permeation buffer, wherein the water-absorbent resin is a product by a process including the step of further crosslinking the surface vicinity of a crosslinked polymer, and this water-absorbing composition is characterized by having a liquid permeation buffering index of not less than 0.Type: GrantFiled: July 6, 2000Date of Patent: July 1, 2003Assignee: Nippon Shokubai Co., Ltd.Inventors: Takumi Hatsuda, Kazuki Kimura, Koji Miyake, Eri Goto, Katsuyuki Wada
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Patent number: 6576713Abstract: The present invention provides a production process for a water-absorbent resin powder which is excellent in particle diameter distribution and properties, wherein the production process not only inhibits adhesion and aggregation in the production steps, but also is excellent in energy efficiency, drying efficiency, and productivity.Type: GrantFiled: February 22, 2001Date of Patent: June 10, 2003Assignee: Nippon Shokubai Co., Ltd.Inventors: Kunihiko Ishizaki, Teruyuki Kanto, Nobuyuki Harada, Takumi Hatsuda, Shinichi Fujino
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Patent number: 6562879Abstract: The present invention provides a water-absorbent resin powder and its production process and use, wherein the water-absorbent resin powder has high liquid permeability and high water absorbency. The production process for a water-absorbent resin powder, according to the present invention, comprises the step of obtaining water-absorbent crosslinked polymer particles by an aqueous solution polymerization step, and grinding the resultant crosslinked polymer particles until the bulk density thereof increases to not lower than 0.72 (g/ml). The water-absorbent resin powder is characterized by being arbitrarily pulverized and having a bulk density of not lower than 0.74 (g/ml) and a water absorption capacity of not lower than 20 (g/g) for 0.9 weight % physiological saline under a load of 0.7 psi (4.83 kPa). In addition, the absorbent structure comprises the above water-absorbent resin powder and a fibrous material. The absorbent article comprises an absorbent layer including the above absorbent structure.Type: GrantFiled: February 11, 2000Date of Patent: May 13, 2003Assignee: Nippon Shokubai Co., Ltd.Inventors: Takumi Hatsuda, Hiroyuki Ikeuchi, Koji Miyake, Yoshio Irie, Kunihiko Ishizaki
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Publication number: 20030008946Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.Type: ApplicationFiled: August 5, 2002Publication date: January 9, 2003Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
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Publication number: 20020161132Abstract: In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a &bgr;-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.Type: ApplicationFiled: March 29, 2002Publication date: October 31, 2002Inventors: Yoshio Irie, Katsuhiro Kajikawa, Kunihiko Ishizaki, Takumi Hatsuda
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Patent number: 6458921Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.Type: GrantFiled: August 26, 2000Date of Patent: October 1, 2002Assignee: Nippon Shokubai Co., Ltd.Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
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Publication number: 20020120074Abstract: The present invention provides: a water-absorbing agent which has excellent urine resistance; a water-absorbing agent which has not only excellent urine resistance, but also excellent absorption properties that are stable to any composition of urine and show little change with time; and production processes and uses for these water-absorbing agents. The present invention water-absorbing agent exhibits a specific or larger value of absorption capacity under a load in a process in which the absorption capacity under a load is measured in a new manner using a specific liquid to be absorbed, and the present invention provides an absorbent matter and an absorbent article which display a specific or larger value of new absorption index as is, for example, led from the absorption capacity under a load or from the resin concentration using the above water-absorbing agent. The present invention further provides a production process for a water-absorbing agent having the above specific parameter.Type: ApplicationFiled: February 22, 1999Publication date: August 29, 2002Inventors: KATSUYUKI WADA, HIROKO UEDA, NAOKO TAKAHASHI, KINYA NAGASUNA, KOJI MIYAKE, YASUHIRO FUJITA, TAKUMI HATSUDA